run for 15 to 20 minutes indoors, should be 29 amperes, while the minimum should
not be lower than 26 amperes. This high charging rate can be used safely, as the
Voltage Regulator automatically reduces the charging rate when battery is fully
charged. When the battery voltage is low, the maximum possible generator output
is available to charge the battery. As the battery voltage increases, the charging
current gradually tapers off and only a small amount flows when the battery is
fully charged. In this manner it is possible to recharge the battery to its charged
state in the shortest possible time without the dangers of overheating which would be
present without a controlled high output generator.
The maximum output on Series 81 models not equipped with radio is controlled
by the third brush. On these models the maximum charging rate with hot generator,
that is, after the engine has been run for 15 or 20 minutes indoors, should be 18
amperes, while the minimum should not be lower than 16 amperes. Higher charging
rates should be avoided to prevent damage to the electrical system.
Fan Belt
The generator is driven by the "V" type belt, which also drives the fan and
water pump. This belt must be kept sufficiently tight to prevent slippage on the
pulleys. When properly adjusted, it should be possible to depress the belt 3/
illustrated in Figure 38, at a point midway between the fan pulley and generator
pulley. This adjustment provides sufficient tightness to prevent slippage without
causing undue wear of the fan and generator bearings.
To tighten belt tension, loosen nut (A) and swing generator away from the
engine until correct position is obtained. Tighten nut (A), also the two lower
mounting cap screw nuts (B).
O W N E R' S M A N U A L 45
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